Blockly UI not showing up

[wborn (Wouter Born)]

If restarting openHAB does not fix it, try a recent milestone which has this fix that should help:

Fix rules stay uninitialized when using Java 17

If you also use Java 15 or newer, then you’ll need the old JavaScript engine for using Blockly by installing this Marketplace add-on:

JavaScript Scripting (Nashorn) [3.3.0.0;4.0.0.0)

[logo] This add-on allows you to use your older JavaScript (ECMAScript 5.1) rules on newer Java versions until they are migrated to JavaScript (ECMAScript 2021+). The add-on uses a standalone Nashorn Engine which was part of Java until it was removed in Java 15. Resources org.openhab.automation.jsscriptingnashorn-3.3.0-SNAPSHOT.jar Source Code